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Health Hazard Evaluations (HHEs)

Each month we will update this page to highlight newly released final reports and information on new and emerging hazards we are evaluating. Check back often to see what we are up to!

What's New

  • Evaluation of Potential Hazards during Harvesting and Processing Cannabis at a Farm
    HHE Program investigators found tetrahydrocannabinol, the psychoactive component in cannabis, on all work surface wipe samples. We also determined that employees are at risk for hand and wrist musculoskeletal disorders if hand trimming tasks are performed for longer periods than we observed. We recommended developing a cleaning schedule for work and tool surfaces, and changing procedures and improving tools to reduce the potential for musculoskeletal disorders. To read the full report go to
  • Evaluation of Brake Dust Exposures at a Hydroelectric Dam
    HHE Program investigators found that concentrations of metals and minerals in the air were well below their occupational exposure limits. Metals and minerals were detected at low concentrations on hands and work surfaces. We recommended evaluating airborne exposures while cleaning the other two generators. To read the full report go to
  • 2016 Health Hazard Evaluation Program Annual Report
    The NIOSH Health Hazard Evaluation (HHE) Program is pleased to share the 2016 annual report. The report includes summaries of interesting projects and other highlights of our year. We hope the report stimulates conversations about who the HHE Program is and how we make a difference for the health and safety of employees throughout the United States. A link to the annual report is available here:
  • New HHE Video Series Shows What Happens on a Site Visit
    Ever wonder what happens when the Health Hazard Evaluation team visits a workplace? Watch 3 new HHE videos to get a glimpse into our activities. Each video shows a different type of testing or sampling conducted in a workplace and reactions from the employer and employees.